html body {
    padding: 0;
    margin: 0;
}

@for $i from 1 through 30 {
    .fz-#(10+$i*2) {
        font-size: (10+$i*2)+px;
    }
}

@for $i from 1 through 30 {
    .w-#{10+$i*10} {
        width: (10+$i*10)+px;
    }
}